<p>TUSCALOOSA | The Tuscaloosa Fire and Rescue Service is investigating three fires that occurred at vacant homes in the Forest Lake neighborhood since September.</p><p>Firefighters responded to fires at the same home on Sept. 12 and Nov. 21. A fire at a house down the street occurred Thursday evening, said Fire Marshal Gene Holcomb.</p><p>The cause of each fire is still under investigation, he said.</p>